Franklin brought all the kidlets into the common room to have a pow-wow. He just wanted them all to be together, lighten a mood, etc, so he could keep an eye on them and everything. Secretly, he was also making sure everything was safe and all clear, before he let them go to their rooms (around midnight).
Feel free to have them complain about it/etc. They probably had popcorn and other bad-for-you snacks and generally had a fun time for a few hours :3 Fun as it gets with an RA around, anyway!